245 results about "Fixed carbon" patented technology

The invention discloses a spectrum pretreatment method for online detection of coal quality through multi-spectrum combination and related equipment. The method comprises the following steps: synchronously collecting LIBS and NIRS spectrums of raw coal by using a multi-spectrum combination online detection coal quality device; respectively carrying out effective screening on the synchronized LIBS and NIRS spectrums; identifying the defocusing amount of each group of synchronized LIBS and NIRS spectrums, and distributing a corresponding defocusing amount label for each group of spectrums; correcting the defocusing spectrum by adopting a spectrum correction method according to the defocusing amount label to obtain corrected LIBS and NIRS spectrums, and fusing the corrected LIBS and NIRS spectrums to obtain a corrected fused spectrum; and analyzing the LIBS spectrum, the NIRS spectrum and the fusion spectrum by adopting a quantitative analysis method, and calculating the fixed carbon content. The LIBS and NIRS spectrum fusion makes up the limitation that a single spectrum can only represent atomic information or molecular information, so that the chemical information of the coal sample is completely represented, and synchronous accurate analysis of multiple coal quality indexes is realized.

A coke product configured to be used in foundry cupolas to melt iron and produce cast iron products is disclosed herein. In some embodiments, the coke product has a Coke Reactivity Index (CRI) of at least 30% and an ash fusion temperature (AFT) less than 1316° C. Additionally or alternatively, the coke product can comprise a fixed carbon content of at least 80% and / or a volatile matter content of no more than 1.0%.

High quality coke products including unique properties, such as Coke Reactivity Index (CRI) properties, fixed carbon content, and sulfur content.

The recovery method of the laterite-nickel ore leaching residues comprises the following steps that S1, in the presence of a first reducing agent, the laterite-nickel ore leaching residues are roasted, and roasted sand and sulfur-containing tail gas are obtained; s2, in the presence of a second reducing agent, smelting the roasted product obtained in the step S1 to obtain molten iron, smelting slag and coal gas; the laterite-nickel ore leaching residues are in a dry state; the smelting slag is a MgO-Al2O3-SiO2-FeO slag system, and the smelting slag is a MgO-Al2O3-SiO2 The ratio of the total mass of fixed carbon in the first reducing agent to the total mass of sulfur in the laterite-nickel ore leaching residues is 0.35-0.50. According to the recycling method, iron and sulfur in the laterite-nickel ore leaching residues can be comprehensively recycled under the condition that extra flux is not needed, resource utilization of the laterite-nickel ore high-pressure leaching residues is achieved under the condition that the overall process cost is low, and large-scale industrial use is facilitated.

The invention provides a method for purifying waste battery black powder acid-leached graphite slag, which comprises the following steps: (1) mixing waste battery black powder acid-leached graphite slag and sulfuric acid to obtain a mixture; (2) roasting the mixture obtained in the step (1) to obtain a roasted material; and (3) the roasted material in the step (2) is subjected to leaching and solid-liquid separation in sequence, and a leaching solution and purified graphite with the fixed carbon content larger than or equal to 99.8% are obtained. According to the scheme provided by the invention, roasting is performed after the sulfuric acid is loaded, so that the waste battery black powder acid leaching graphite slag is purified, the operation is simple, and the purification effect is good.

A coke product configured to be used in foundry cupolas to melt iron and produce cast iron products is disclosed herein. In some embodiments, the coke product has a Coke Reactivity Index (CRI) of at least 30% and an ash fusion temperature (A FT) less than 1316° C. Additionally or alternatively, the coke product can comprise a fixed carbon content of at least 80% and / or a volatile matter content of no more than 1.0%.

The invention discloses an intelligent coal blending method and system for dual-engine staged solution in a power coal scene. The method comprises the following steps: performing structured processing on coal source data and establishing a hundred-ton integer batch variable; the method comprises the following steps of: constructing a hard constraint integer programming (ILP) model, and sequentially executing three stages of solving of cost minimization, heat value deviation minimization under the fixed cost and coal source quantity minimization under the fixed cost and deviation; when any stage is not feasible, automatically switching to a soft constraint target planning (GP) model, performing soft constraint on the coal quality index through a deviation variable, and sequentially performing deviation minimization, cost minimization and coal source quantity minimization; and calculating a combustion stability index (CSI) on the basis of volatile component fluctuation, fixed carbon, ash content change and sulfur content change, and carrying out stability verification on a final coal blending scheme. The system comprises a data management module, a first engine module, a second engine module, an automatic rollback module, a combustion stability index module and a result output module.

This invention discloses a spectral preprocessing method and related equipment for online coal quality detection using multispectral coupling. The method includes: simultaneously acquiring LIBS and NIRS spectra of raw coal using an online coal quality detection device; screening the effectiveness of the synchronized LIBS and NIRS spectra; identifying the defocusing amount of each set of synchronized LIBS and NIRS spectra and assigning a corresponding defocusing amount label to each set of spectra; correcting the defocused spectra according to the defocusing amount label using a spectral correction method to obtain corrected LIBS and NIRS spectra, and then fusing them to obtain a corrected fused spectrum; analyzing the LIBS spectrum, NIRS spectrum, and fused spectrum using quantitative analysis methods, and calculating the fixed carbon content. This invention's LIBS and NIRS spectral fusion overcomes the limitation of a single spectrum only characterizing atomic or molecular information, enabling a complete characterization of the chemical information of the coal sample and achieving simultaneous and accurate analysis of multiple coal quality indicators.

This solid fuel comprises: a biocoke of at least 85% fixed carbon on the anhydrous ash-free basis; and an inorganic binder containing CaO in a dry state at 50 mass% or higher. This method for producing a solid fuel comprises a step in which a solid fuel is obtained by kneading and molding a molding starting material comprising: a biocoke of at least 85% fixed carbon on the anhydrous ash-free basis; an inorganic binder containing CaO in a dry state at 50 mass% or higher; and water.

The invention discloses a method for improving stability of steel slag by regulating and controlling treatment atmosphere, which comprises the following steps: S1, crushing the steel slag until the particle size is less than or equal to 10mm, and wetting until the water content is 5-20%, S2, putting the steel slag treated in the step S1 into a closed container, injecting CO2 gas into the closed container until the CO2 gas reaches a preset partial pressure value, s3, injecting saturated water vapor into the closed container until the total pressure reaches a preset total pressure value, and forming wet and hot acidic wet and hot mixed gas by using the water vapor and CO2, and S4, after the total pressure of the closed container reaches the preset total pressure value, keeping for 2-12 hours under a constant pressure condition, and carrying out hydration and carbonization reaction on free calcium oxide and free magnesium oxide in the steel slag and the mixed gas to generate calcium carbonate and magnesium carbonate. According to the method, the dual effects of improving the stability of the steel slag and effectively fixing carbon can be achieved, comprehensive utilization of the steel slag in civil engineering is achieved, meanwhile, CO2 tail gas captured by a steel mill is utilized, carbon is effectively fixed, and carbon emission is reduced.

The invention relates to a carbonaceous reducing agent pellet with low-order non-caking coal as a main body and application, and belongs to the technical field of efficient and clean utilization of resources. The carbonaceous reducing agent pellets are mainly prepared from low-order non-caking coal as a main body, the main body is matched with a composite organic binder, silica fume and a reinforcing agent, the mixture is subjected to compression molding and then placed in a sintering furnace to be roasted at the temperature of 450-650 DEG C in a protective atmosphere, and furnace cooling is conducted till the carbonaceous reducing agent pellets are obtained. The pellet developed by the invention has the characteristics of high fixed carbon content, high pellet strength, high breakage resistance, good static spheroidization index, low content of introduced impurities and high reaction activity, so that the pellet is particularly suitable for industrial silicon smelting. The low-order non-caking coal is applied in a large proportion, the micro-silicon powder produced by the submerged arc furnace is recycled, and the method is clean and environment-friendly, can be completely used for smelting and production of industrial silicon, reduces smelting unit consumption and production cost, and can replace or partially replace charcoal to become a carbonaceous reducing agent for smelting of industrial silicon.

To provide a solid fuel containing waste plastics, which generates little chlorine-based gas and can use chlorine-based waste plastics, and a method for manufacturing the same. There is provided a solid fuel containing industrial waste plastics, which comprises a first layer made of a heat-melted product obtained by heating and melting industrial waste plastics in a reducing atmosphere, and a second layer consisting of inorganic fibers and a binder, and which contains 5 to 95 mass% of the industrial waste plastics, 5 to 50 mass% of the inorganic fibers, and 0.5 to 50 mass% of the binder. The industrial waste plastics include polyester resin, polystyrene resin, and polyvinyl chloride resin. The solid fuel has an ash content of 20 mass% or less, fixed carbon of 20 to 30 mass%, and a volatile matter content of 50 to 70 mass%. The ash content includes 5 mass% or less of calcium oxide (CaO), 10 mass% or less of silicon dioxide (SiO2), and 5 mass% or less of aluminum oxide (Al2O3).SELECTED DRAWING: Figure 1

The invention discloses an artificial geothermal reservoir construction and development method based on oil shale reverse oxidation, and belongs to the technical field of resource exploitation, the method comprises the following steps: reservoir well construction: arranging an injection well, an exploitation well and a heat recovery well in a target layer section; an initial high-temperature environment is formed through manual heating, so that the oil shale is pyrolyzed to generate fixed carbon; injecting air to form an oxygen-enriched environment, initiating a fixed carbon oxidation self-heating reaction, and continuously pyrolyzing the oil shale; terrestrial heat is exploited through a circulating working medium, the air flow and components are dynamically controlled, and temperature control and safe operation are achieved; and finally reinjecting and sealing the carbon dioxide. The device can convert low-grade oil shale into clean geothermal energy, and has the advantages of energy conservation and environmental protection.

The invention relates to a method for full utilization of steel slag, in particular to a method for preparing high-stability compact stone by using steel slag and recovering waste heat. The method mainly comprises the processes of molten steel slag compactness regulation and control, thermal crushing, pressure steam carbonation and recovery of part of sensible heat of the steel slag. The obtained steel slag product can replace natural stones to be used for traffic infrastructure construction. Converter steelmaking final slag is pretreated through molten steel slag solidification regulation and pressure steam carbonation, compact steel slag particles are obtained through combination of a specific air inlet system and rolling crushing, then calcium and magnesium minerals are utilized to rapidly fix carbon dioxide and stabilize volume expansion elements at a high temperature, all steel slag resources are made into stone, and the steel slag resource utilization rate is increased. Meanwhile, part of sensible heat of the full-temperature-section steel slag is recovered. The steel slag stone with a stable and compact surface can be obtained after the treatment of the method. An efficient and value-added treatment mode is provided for large-scale absorption of the steel slag, and the method can be widely applied to high-temperature steel slag treatment in the metallurgical industry.

According to the solid waste pyrolysis and melting integrated treatment system, the pyrolysis carbonization furnace, the melting furnace and the secondary combustion chamber are combined together and arranged from top to bottom, the air guiding and material scraping structure is arranged at the bottom of the pyrolysis carbonization furnace, pyrolyzed carbide generated after a pyrolysis reaction in the pyrolysis carbonization furnace is crushed through the air guiding and material scraping structure, and pyrolysis slag is obtained; other treatment equipment does not need to be added, the pyrolysis slag is directly fed into the melting furnace for further heating melting treatment in a hot state without being cooled, the material treatment process is shortened, the hot slag is directly melted, waste heat of the slag is avoided, the fed material in the melting furnace is high-temperature hot slag, heat needed for heating the hot slag to the melting temperature in the melting furnace is less, and the energy consumption is reduced. And fixed carbon generated by pyrolysis in the hot slag can be used as a fuel source, so that less fuel is needed for melting, and the construction and operation cost of the heat treatment system is greatly reduced. Meanwhile, the invention further discloses a solid waste pyrolysis and fusion integrated treatment process.

The invention belongs to the technical field of metallurgical production, and discloses a low-energy-consumption blast furnace coke and ore tank fly ash mixing energy-saving conveying device and method.The low-energy-consumption blast furnace coke and ore tank fly ash mixing energy-saving conveying device comprises a material mixing box, a material mixing mechanism for premixing coke tank fly ash and ore tank fly ash is arranged on the material mixing box, and the material mixing mechanism comprises a mounting cavity and a first motor; two rotating rods are rotatably connected in the mounting cavity, spiral grooves are formed in the rotating rods, driving gears are fixedly connected to the top ends of the rotating rods, a plurality of driven rods are rotatably connected in the mounting cavity, stirring blades are fixedly connected to the driven rods, and driven gears are fixedly connected to the top ends of the driven rods; the dust removal device has the beneficial effects that dust removal ash can be fully and uniformly mixed in the conveying process, the fixed carbon content of sintered ore is effectively stabilized, and the metallurgical performance of the sintered ore is remarkably improved.

The present invention discloses a method for upgrading semi-coke to prepare raw materials for injection and sintering, comprising the following steps: mixing and kneading semi-coke powder, high fixed-carbon powder, binder and upgrading improver to obtain shaped raw materials; pressing the shaped raw materials to form semi-coke pellets with regular shapes; carbonizing the semi-coke pellets to obtain upgraded semi-coke pellets; and crushing and screening the upgraded semi-coke pellets to obtain raw materials for injection and sintering. The present invention uses a combined process of shaping + carbonization to process semi-coke powder and produce high-quality upgraded carbon materials; after pyrolysis and upgrading, the volatile matter of the semi-coke powder in the present invention can be significantly reduced from the current 8-12% to less than 4.5%, which is a clean and pure carbon material raw material and can be used as raw materials for injection and sintering in steel production.

The invention discloses an oil shale in-situ oxidation heat collection system and method, and belongs to the technical field of oil shale in-situ development and utilization. Comprising a well pattern structure and a ground power generation device. The well pattern structure comprises an injection well, a heat recovery well and a plurality of observation wells; an electromagnetic sensor is arranged in each observation well, the oil shale layer is fractured through hydraulic fracturing to form fractures, the injection well communicates with the heat recovery well, and nanometer magnetic induction particles are added into fracturing fluid to serve as a propping agent; the observation well is used for monitoring the distribution condition and the magnetic field intensity of the nano magnetic induction particles; organic matters and fixed carbon in the oil shale are directly oxidized to release heat in an underground in-situ state, low-temperature steam is used as a heat transfer fluid to extract heat energy released by oxidation of the oil shale for power generation, and the method can be used for development of oil gas resources of the oil shale and shale with medium and low maturity.

This invention relates to the field of iron and steel smelting technology, and proposes a method for improving the sintering uniformity of sintering mixtures. The method includes: preparing a first mixture for laying on the lower layer of a sintering machine trolley, and a second mixture for laying on the upper layer thereon, wherein the mass percentage of the first mixture is higher than that of the second mixture, the mass content of fixed carbon in the first mixture is lower than that in the second mixture, and the mass percentage of limestone in the flux used in the first mixture is higher than that in the second mixture; the first mixture is firstly distributed at the head of the sintering machine, and then the second mixture is secondly distributed at the head of the sintering machine; after the distribution is completed, sintering is performed by suction ignition. This invention improves the uniformity of strength and yield between the upper and lower layers of sintered ore, and increases sintering production efficiency.

The present invention proposes a large scale flake graphite classification rapid flotation method, comprising the following steps: (1) the raw ore is subjected to grinding and screening to obtain undersize and oversize, the oversize is returned to the grinding operation, the undersize enters the hydrocyclone for particle size separation, and a grit product and an overflow product are obtained; (2) the overflow product is subjected to a roughing selection to obtain a final tailing and a roughing concentrate, the roughing concentrate is subjected to a re-grinding and re-selection to obtain a re-selection concentrate; (3) the grit product is subjected to a rapid flotation operation to obtain a rapid flotation concentrate and a flotation tailing, and the flotation tailing is returned to the grinding operation in step (1); (4) the rapid flotation concentrate is combined with the re-selection concentrate and subjected to multiple stages of re-grinding and re-selection to obtain a graphite concentrate. The method of the present invention improves the fixed carbon content in the graphite concentrate under the condition of ensuring the fixed carbon recovery rate of the graphite concentrate, and the proportion of +100 mesh flake graphite is greatly increased, thereby avoiding the serious loss of fixed carbon in the tailings due to the protection of large flakes.

The invention relates to the technical field of green construction scheduling, in particular to a muck disposal method and system oriented to carbon emission optimization. The method comprises the following steps: obtaining muck disposal data, and extracting muck fixed disposal data and muck non-fixed disposal data; performing carbon factor decoupling calculation on the fixed disposal data to obtain fixed carbon emission data; constructing a disposal element graph based on the non-fixed disposal data, and calculating an edge floating value to generate a non-fixed disposal graph; executing disturbance perception propagation, and constructing a disturbance perception graph; path carbon emission accumulative reasoning is carried out based on the disturbance perception graph, and path carbon emission expected data are obtained; calculating a path carbon emission probability to obtain non-fixed carbon emission data; and finally, fusing the fixed and non-fixed carbon emission data, carrying out carbon load optimization scheduling, and outputting a carbon load optimization result. According to the invention, low-carbon path evaluation and intelligent scheduling under a multi-source disposal behavior are realized, and the precision and execution efficiency of carbon emission control are improved.

The present invention discloses a method for comprehensive recovery of fixed carbon and titanium resources in molten salt chloride slag, which adopts pre-screening-coarse grain grinding-flotation to pre-enrich organic carbon-organic coarse concentrate, then grinding and flotation to select organic carbon concentrate-floating carbon tailings to screen coarse particles as titanium concentrate 1-flotation to recover fine-grained titanium concentrate 2, and recover fixed carbon and titanium resources, thereby achieving the effect of significant enrichment of fixed carbon and TiO2 components; overcoming the defects of molten salt chloride slag currently being treated by stacking or landfilling, which will occupy a large amount of land resources and have environmental risks. This method enables fixed carbon to be used as fuel, and the titanium concentrate product is used alone, added to the titanium concentrate electric furnace smelting operation, or as a sulfuric acid process titanium dioxide raw material, thereby achieving high-value recovery of solid waste, with the advantages of relatively low process cost and easy industrialization, and can be widely used in the comprehensive utilization field of vanadium titanium magnetite high calcium magnesium titanium concentrate molten salt chloride slag, and has great practical value and promotion value.

The invention relates to the technical field of blast furnace ironmaking, in particular to an unfired pulverized coal generation quantity calculation method based on blast furnace operation parameters. The method specifically comprises the following steps: S1, acquiring a plurality of key operation parameters of the blast furnace; s2, inputting the plurality of key operation parameters into a pre-constructed unfired pulverized coal amount prediction model; the prediction model is a mathematical model reflecting a nonlinear relation between the key operation parameters and the unburned pulverized coal amount; s3, outputting a predicted value of the unburned pulverized coal amount of the blast furnace by the prediction model; wherein the plurality of key operation parameters at least comprise the temperature of blown hot air, the oxygen enrichment rate of the blown hot air, the strength after the thermal reaction of the charged coke, the grade of charged raw material iron, the fixed carbon content of the mixed pulverized coal, the volatile component content of the mixed pulverized coal, the fineness of the mixed pulverized coal and the coal injection quantity per ton of iron. Existing operation data can be fully utilized, and the quantity of unburned pulverized coal can be rapidly and accurately analyzed.

The invention belongs to the technical field of carbon emission, and particularly discloses a life cycle-based carbon emission accounting method for a household garbage fine utilization system, and the life cycle comprises a garbage collection and transportation stage, a fine treatment stage and a resource recovery stage. The method comprises the following steps: determining a first carbon emission amount for transporting household garbage in a garbage collection and transportation stage; determining a second carbon emission in a fine treatment stage based on the carbon emission released when different types of household garbage are treated by using different recovery processes; based on the carbon emission reduction amount of the fuel product and the carbon sequestration amount of the carbon sequestration product generated in the refining treatment stage, determining the third carbon emission amount of the resource recovery stage; and carbon emission accounting of the life fine utilization system is completed based on the first carbon emission, the second carbon emission and the third carbon emission. According to the invention, quantitative accounting is carried out on the carbon emission in the system life cycle, and more accurate carbon accounting is achieved.

The present application relates to coal gangue treatment technical field, provide a kind of coal gangue-containing biofuel particle and its preparation method and application.The biofuel particle provided by the present application includes: coal gangue powder 60~62%;14~15% of oil-stained mixture;High molecular waste powder 24~26%;The oil-stained mixture is waste engine oil and / or oil-stained material;The oil-stained material is obtained by crushing and drying in turn from swill.The oil-stained mixture used in the present application is rich in oil and fat, with high volatile matter, easy to ignite, coal gangue and waste tires and / or waste plastic bottles have high fixed carbon content, long burning time, so that the biofuel particle of the present application has high calorific value, stable combustion, can be used as alternative fuel to alleviate the problem of traditional fossil fuel shortage.The present application uses catering leftovers swill, waste tires and / or waste plastic bottles and coal gangue powder, to prepare biofuel particles, which solves the various hazards caused by long-term storage of coal gangue.

The invention discloses a steel slag waste heat recovery device and process capable of synergistically fixing carbon, and relates to the field of steel slag pretreatment in the metallurgical industry, the steel slag waste heat recovery device comprises a hot-state steel slag receiving hopper, a hot-state steel slag chain scraper conveyor, a boiler bottom water tank, a boiler system, a cold-state steel slag bucket elevator conveyor, a carbon fixation reaction box body, a CO2 gas supply system and a cold slag conveying belt which are connected in sequence. According to the process, hot-state steel slag reacts with slag disintegrating water in a water tank at the bottom of a boiler to generate combustible gas, and the combustible gas combusts in a boiler system to heat circulating water to generate high-temperature and high-pressure steam to realize waste heat recovery; warm-state steel slag at 60-80 DEG C after slag disintegration and purified CO2-containing industrial waste gas are subjected to carbonation reaction in a carbon sequestration reaction box, the content of free calcium oxide and free magnesium oxide in the steel slag is reduced, and CO2 solid storage is achieved synchronously. The method is high in waste heat recovery efficiency, stable in steam output and remarkable in carbon sequestration effect, the resource utilization value of the steel slag is greatly improved, outstanding economic and environmental protection benefits are achieved, and iron and steel enterprises are assisted to achieve the dual-carbon target.

The invention discloses a deep coal seam coal phase type division method considering industrial component contents, and relates to the technical field of unconventional reservoir exploration and development. The method comprises the following steps: obtaining a target coal sample in a research area, respectively carrying out industrial component testing and submicroscopic component identification and determination on the target coal sample, and calculating coal phase parameters according to the actual submicroscopic component content; performing correlation analysis on the coal phase parameters, and discussing the repeatability of representing the coal phase characteristics under different coal phase parameters; key coal phase parameters are screened out through correlation among the coal phase parameters, and coal phase basic types are divided out through a coal phase parameter cross plot; finally, the content difference of ash, moisture, volatile components and fixed carbon in industrial components in the coal phase and the influence on micropores are considered, the type of the coal phase is further refined, subsequent construction of a deep coal seam coal phase type division method is facilitated, and a good data basis and a type division thought are provided for the deep coal seam coal phase type division method.

The utility model belongs to the technical field of carbon production, and particularly discloses a machine-made carbon carbonization furnace. The carbonization furnace comprises a carbonization furnace body, a furnace body is arranged in the carbonization furnace body, a soaking assembly is arranged in the furnace body, a cooling assembly is arranged between the carbonization furnace body and the furnace body, the soaking assembly comprises a driving unit and a stirring unit, the driving unit comprises a motor, the stirring unit comprises a stirring rod, and materials are fully mixed and turned through the soaking assembly, so that the stirring efficiency is improved. Heat can be more quickly and uniformly transferred to each part of a material, uniform heating ensures the consistency of the material in the carbonization process, produced machine-made carbon is more stable in performance, heat value, fixed carbon content and the like and higher in quality, and due to uniform heat distribution, the situation of local overheating or insufficient heating is avoided, and the service life of the machine-made carbon is prolonged. Energy additionally consumed for achieving the same carbonization effect is reduced, so that the heating time is shortened, and the production efficiency is improved.

The invention relates to a chemical-electrochemical combined preparation method of high-purity expanded graphite, in particular to a chemical-electrochemical combined preparation method of high-purity expanded graphite. In order to solve the problem that the fixed carbon content of the existing high-purity expanded graphite is lower than 99.9% or the preparation process is complicated, the preparation method comprises the following steps: adding sodium hydroxide and pure water into crystalline flake graphite, carrying out alkali fusion reaction, filter pressing and pure water washing to be neutral, adding nitric acid, carrying out acid leaching reaction and filter pressing squeezing, adding concentrated nitric acid, and carrying out electrochemical oxidation intercalation reaction to obtain the high-purity expanded graphite. Washing with pure water, carrying out filter pressing and squeezing, and then drying and puffing to obtain high-purity expanded graphite; the chemical-electrochemical combined method disclosed by the invention has the advantages that a single concentrated nitric acid is used while a chemical oxidant is not used, and the fixed carbon content of the expanded graphite is greater than or equal to 99.9%. The invention is applied to the preparation method of the high-purity expanded graphite.

A coke product configured to be used in foundry cupolas to melt iron and produce cast iron products is disclosed herein. In some embodiments, the coke product has a Coke Reactivity Index (CRI) of at least 30% and an ash fusion temperature (AFT) less than 1316° C. Additionally or alternatively, the coke product can comprise a fixed carbon content of at least 80% and / or a volatile matter content of no more than 1.0%.